AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Autori: VASILE CHIŞ, R. TETEAN, N. LEOPOLD.
Published Online: 2017-01-05
Published Print: 2017-01-31
VIEW PDF: STRUCTURAL AND MAGNETIC CHARACTERIZATION OF Fe3O4 NANOPARTICLES SYNTHESIZED AT ROOM TEMPERATURE
Magnetite nanoparticles without surfactants were obtained by room temperature synthesis. X-ray diffraction data show that the nanoparticles crystallize in a cubic single phase structure. An average crystallite size of around 24 nm was calculated. The obtained Fe3O4 nanoparticles are ferrimagnetic at 4 K and at 300 K, too. It was shown that a ferrimagnetic to superparamagnetic transition is present, even if the superparamagnetic state is not pure. We assume that the true long-range ferromagnetic coupling is absent due to the small grain size of the sample.
Keywords: magnetite nanoparticles, X-ray diffraction, magnetization
